164 Wisconsin Academy of Sciences, Arts, and Letters. 
subtenraneus, Rhizobius Kaltenbach, 1843. Mon. der Pflanzen- 
lause, p. 209. 
Tsuga canadensis. 
subterrans, Amphorophora Wilson, 1915. Trans. Amer. Ent. Soc., 
XLI, p. 99, fig. 
Dactylis glomerata. 
suffragans, Aphis Walker, 1848. The Zool. VI, p. 2221. 
Lycopsis arvensis. 
superabilis, Aphis Walker, 1852. List. Homop. Insects Brit. Mu¬ 
seum, part 4, p. 1039. 
No food plant given. 
swezeyi, Aphis Pullaway, 1910. Kept. Hawaii Agr. Exp. Sta., 
(1909), p. 36, fig. 
Gnaphalium sp. 
symmetrica, Phylloxera Pergande, 1904. Proc. Dav. Acad. Sci., 
IX, p. 230. 
Carya aWa. 
symmetrica. Phylloxera var. purpurea Pergande, 1904. Proe. 
Daven. Acad. Sci., IX, p. 233. 
Carya alba. 
symmetrica. Phylloxera var. vasculosa Pergande, 1904. Pro6^. 
Daven. Acad. Sci., IX, p. 233. 
Carya alba. 
symphiti. Aphis Schrank, 1801. Fauna Boica, II, p. 107. 
Achillea millefolum, Anchusa italica, Arctium lappa, Capsella 
bursa-past or is, Carduus anchanthoides, C. crispus, C. nutans, 
Circium lanceolatum, Citrullus vulgaris, Cucurbita clypci- 
formis, C. maxima, C. pepo, Cynoglossum offlcinale, Echinos- 
permum lappula, Echium vulgare, Oaleopsis ladanum, Myosotis 
palustris, M. sylvatica, Onopordon achantium, Stacyhs recta, 
Symphifum officinale. 
symphoricarpi, Aphis Thomas, 1877. Ill. State Lab. Nat. Hist., 
Bui. 2, p. 12. 
Symphoricarpos occidentalis, 8. orbiculatus, 8. racemosa. 
tabaci, Macrosiphum (Pergande), 1898. Can Ent. XXX, p. 300. 
N ectar ophora. 
Chrysanthemum leucanthemum, Forsythia viridissima, Lycoper- 
sicum esculentum, Nicotiana tabacum, Pyrus communis, P. 
malus, Rumex crispus, 8olanum melongena. 
